| ULX . | Obs.ID . | Obs. date . | Useful exposure . | Lx . | Count rate . |
|---|---|---|---|---|---|
| . | . | . | (ks) . | ( × 1039 erg s− 1) . | (ct s−1) . |
| NGC 5408 X-1 | 0302900101 | 2006-01-13 | 85.4 | 4.8 | 1.0 |
| 4.85 Mpc | 0500750101 | 2008-01-13 | 28.6 | 4.5 | 0.9 |
| 0653380201 | 2010-07-17 | 71.8 | 5.6 | 1.2 | |
| 0653380301 | 2010-07-19 | 88.2 | 5.6 | 1.1 | |
| 0653380401 | 2011-01-26 | 73.4 | 5.3 | 1.1 | |
| 0653380501 | 2011-01-28 | 69.2 | 5.3 | 1.0 | |
| NGC 6946 X-1 | 0200670101 | 2004-06-09 | 2.1 | 3.8 | 0.3 |
| 5.96 Mpc | 0200670301 | 2004-06-13 | 10.0 | 3.0 | 0.3 |
| 0200670401 | 2004-06-25 | 3.2 | 3.8 | 0.3 | |
| 0401360301 | 2006-06-18 | 2.7 | 3.4 | 0.3 | |
| 0500730101 | 2007-11-08 | 17.4 | 3.0 | 0.2 | |
| 0500730201 | 2007-11-02 | 24.5 | 2.6 | 0.2 | |
| 0691570101 | 2012-10-21 | 81.1 | 3.8 | 0.4 | |
| NGC 5204 X-1 | 0142770101 | 2003-01-06 | 13.9 | 4.8 | 0.6 |
| 5.15 Mpc | 0142770301 | 2003-04-25 | 4.1 | 6.4 | 0.8 |
| 0150650301 | 2003-05-01 | 4.6 | 6.7 | 1.0 | |
| 0405690101 | 2006-11-15 | 1.7 | 7.9 | 1.2 | |
| 0405690201 | 2006-11-19 | 30.4 | 7.3 | 1.0 | |
| 0405690501 | 2006-11-25 | 20.9 | 6.0 | 0.8 | |
| NGC 1313 X-1/X-2 | 0106860101 | 2000-10-17 | 11.9 | 4.9/1.5 | 0.7/0.2 |
| 3.95 Mpc | 0150280301 | 2003-12-21 | 7.0 | 8.6/6.4 | 1.0/0.9 |
| 0150280401 | 2003-12-23 | 3.0 | 6.4/7.5 | 0.7/1.0 | |
| 0150280501 | 2003-12-25 | 6.6 | −/2.8 | −/0.5 | |
| 0150280601 | 2004-01-08 | 8.2 | 7.7/2.2 | 0.8/0.4 | |
| 0205230301 | 2004-06-05 | 8.6 | 6.7/7.5 | 1.0/1.0 | |
| 0205230401 | 2004-08-23 | 3.8 | 3.0/1.7 | 0.6/0.3 | |
| 0205230501 | 2004-11-23 | 12.5 | −/1.7 | −/0.3 | |
| 0205230601 | 2005-02-07 | 8.4 | 5.2/7.1 | 0.6/1.0 | |
| 0301860101 | 2006-03-06 | 16.6 | −/6.5 | −/0.7 | |
| 0405090101 | 2006-10-15 | 74.0 | 4.9/6.2 | 0.7/0.7 | |
| Ho II X-1 | 0112520601 | 2002-04-10 | 4.6 | 8.5 | 3.2 |
| 3.34 Mpc | 0112520701 | 2002-04-16 | 2.1 | 7.7 | 2.8 |
| 0112520901 | 2002-09-18 | 3.5 | 1.9 | 0.8 | |
| 0200470101 | 2004-04-15 | 22.2 | 9.1 | 3.1 | |
| 0561580401 | 2010-03-26 | 21.0 | 3.3 | 1.3 | |
| Ho IX X-1 | 0112521001 | 2002-04-10 | 7.0 | 14.6 | 1.9 |
| 4.23 Mpc | 0112521101 | 2002-04-16 | 7.6 | 16.7 | 2.2 |
| 0200980101 | 2004-09-26 | 57.2 | 12.6 | 1.5 | |
| 0657801801 | 2011-09-26 | 6.9 | 23.1 | 2.5 | |
| 0657802001 | 2011-03-24 | 2.7 | 16.7 | 1.4 | |
| 0657802201 | 2011-11-23 | 12.6 | 22.1 | 2.3 | |
| IC 342 X-1 | 0093640901 | 2001-02-11 | 4.8 | 3.4 | 0.3 |
| 3.61 Mpc | 0206890101 | 2004-02-20 | 6.8 | 7.5 | 0.9 |
| 0206890201 | 2004-08-17 | 17.1 | 3.9 | 0.4 | |
| 0206890401 | 2005-02-10 | 3.3 | 11.0 | 1.2 | |
| NGC 55 ULX-1 | 0028740201 | 2001-11-14 | 30.4 | 1.5 | 1.4 |
| 1.95 Mpc | 0655050101 | 2010-05-24 | 56.6 | 0.6 | 0.8 |
| ULX . | Obs.ID . | Obs. date . | Useful exposure . | Lx . | Count rate . |
|---|---|---|---|---|---|
| . | . | . | (ks) . | ( × 1039 erg s− 1) . | (ct s−1) . |
| NGC 5408 X-1 | 0302900101 | 2006-01-13 | 85.4 | 4.8 | 1.0 |
| 4.85 Mpc | 0500750101 | 2008-01-13 | 28.6 | 4.5 | 0.9 |
| 0653380201 | 2010-07-17 | 71.8 | 5.6 | 1.2 | |
| 0653380301 | 2010-07-19 | 88.2 | 5.6 | 1.1 | |
| 0653380401 | 2011-01-26 | 73.4 | 5.3 | 1.1 | |
| 0653380501 | 2011-01-28 | 69.2 | 5.3 | 1.0 | |
| NGC 6946 X-1 | 0200670101 | 2004-06-09 | 2.1 | 3.8 | 0.3 |
| 5.96 Mpc | 0200670301 | 2004-06-13 | 10.0 | 3.0 | 0.3 |
| 0200670401 | 2004-06-25 | 3.2 | 3.8 | 0.3 | |
| 0401360301 | 2006-06-18 | 2.7 | 3.4 | 0.3 | |
| 0500730101 | 2007-11-08 | 17.4 | 3.0 | 0.2 | |
| 0500730201 | 2007-11-02 | 24.5 | 2.6 | 0.2 | |
| 0691570101 | 2012-10-21 | 81.1 | 3.8 | 0.4 | |
| NGC 5204 X-1 | 0142770101 | 2003-01-06 | 13.9 | 4.8 | 0.6 |
| 5.15 Mpc | 0142770301 | 2003-04-25 | 4.1 | 6.4 | 0.8 |
| 0150650301 | 2003-05-01 | 4.6 | 6.7 | 1.0 | |
| 0405690101 | 2006-11-15 | 1.7 | 7.9 | 1.2 | |
| 0405690201 | 2006-11-19 | 30.4 | 7.3 | 1.0 | |
| 0405690501 | 2006-11-25 | 20.9 | 6.0 | 0.8 | |
| NGC 1313 X-1/X-2 | 0106860101 | 2000-10-17 | 11.9 | 4.9/1.5 | 0.7/0.2 |
| 3.95 Mpc | 0150280301 | 2003-12-21 | 7.0 | 8.6/6.4 | 1.0/0.9 |
| 0150280401 | 2003-12-23 | 3.0 | 6.4/7.5 | 0.7/1.0 | |
| 0150280501 | 2003-12-25 | 6.6 | −/2.8 | −/0.5 | |
| 0150280601 | 2004-01-08 | 8.2 | 7.7/2.2 | 0.8/0.4 | |
| 0205230301 | 2004-06-05 | 8.6 | 6.7/7.5 | 1.0/1.0 | |
| 0205230401 | 2004-08-23 | 3.8 | 3.0/1.7 | 0.6/0.3 | |
| 0205230501 | 2004-11-23 | 12.5 | −/1.7 | −/0.3 | |
| 0205230601 | 2005-02-07 | 8.4 | 5.2/7.1 | 0.6/1.0 | |
| 0301860101 | 2006-03-06 | 16.6 | −/6.5 | −/0.7 | |
| 0405090101 | 2006-10-15 | 74.0 | 4.9/6.2 | 0.7/0.7 | |
| Ho II X-1 | 0112520601 | 2002-04-10 | 4.6 | 8.5 | 3.2 |
| 3.34 Mpc | 0112520701 | 2002-04-16 | 2.1 | 7.7 | 2.8 |
| 0112520901 | 2002-09-18 | 3.5 | 1.9 | 0.8 | |
| 0200470101 | 2004-04-15 | 22.2 | 9.1 | 3.1 | |
| 0561580401 | 2010-03-26 | 21.0 | 3.3 | 1.3 | |
| Ho IX X-1 | 0112521001 | 2002-04-10 | 7.0 | 14.6 | 1.9 |
| 4.23 Mpc | 0112521101 | 2002-04-16 | 7.6 | 16.7 | 2.2 |
| 0200980101 | 2004-09-26 | 57.2 | 12.6 | 1.5 | |
| 0657801801 | 2011-09-26 | 6.9 | 23.1 | 2.5 | |
| 0657802001 | 2011-03-24 | 2.7 | 16.7 | 1.4 | |
| 0657802201 | 2011-11-23 | 12.6 | 22.1 | 2.3 | |
| IC 342 X-1 | 0093640901 | 2001-02-11 | 4.8 | 3.4 | 0.3 |
| 3.61 Mpc | 0206890101 | 2004-02-20 | 6.8 | 7.5 | 0.9 |
| 0206890201 | 2004-08-17 | 17.1 | 3.9 | 0.4 | |
| 0206890401 | 2005-02-10 | 3.3 | 11.0 | 1.2 | |
| NGC 55 ULX-1 | 0028740201 | 2001-11-14 | 30.4 | 1.5 | 1.4 |
| 1.95 Mpc | 0655050101 | 2010-05-24 | 56.6 | 0.6 | 0.8 |
Notes: observational properties of the sample of ULXs studied in this paper including the XMM–Newton observation ID, date of exposure, duration of spectral exposure (after accounting for background flares and dead time), 0.3–10 keV X-ray luminosity (absorbed, determined from the model as per the text) using distances from NASA NED (http://ned.ipac.caltech.edu) provided below the source name, and EPIC-PN count rate. In the case of NGC 1313, ‘-’ indicates that X-1 was outside of the detector's field of view when the observation was taken.
| ULX . | Obs.ID . | Obs. date . | Useful exposure . | Lx . | Count rate . |
|---|---|---|---|---|---|
| . | . | . | (ks) . | ( × 1039 erg s− 1) . | (ct s−1) . |
| NGC 5408 X-1 | 0302900101 | 2006-01-13 | 85.4 | 4.8 | 1.0 |
| 4.85 Mpc | 0500750101 | 2008-01-13 | 28.6 | 4.5 | 0.9 |
| 0653380201 | 2010-07-17 | 71.8 | 5.6 | 1.2 | |
| 0653380301 | 2010-07-19 | 88.2 | 5.6 | 1.1 | |
| 0653380401 | 2011-01-26 | 73.4 | 5.3 | 1.1 | |
| 0653380501 | 2011-01-28 | 69.2 | 5.3 | 1.0 | |
| NGC 6946 X-1 | 0200670101 | 2004-06-09 | 2.1 | 3.8 | 0.3 |
| 5.96 Mpc | 0200670301 | 2004-06-13 | 10.0 | 3.0 | 0.3 |
| 0200670401 | 2004-06-25 | 3.2 | 3.8 | 0.3 | |
| 0401360301 | 2006-06-18 | 2.7 | 3.4 | 0.3 | |
| 0500730101 | 2007-11-08 | 17.4 | 3.0 | 0.2 | |
| 0500730201 | 2007-11-02 | 24.5 | 2.6 | 0.2 | |
| 0691570101 | 2012-10-21 | 81.1 | 3.8 | 0.4 | |
| NGC 5204 X-1 | 0142770101 | 2003-01-06 | 13.9 | 4.8 | 0.6 |
| 5.15 Mpc | 0142770301 | 2003-04-25 | 4.1 | 6.4 | 0.8 |
| 0150650301 | 2003-05-01 | 4.6 | 6.7 | 1.0 | |
| 0405690101 | 2006-11-15 | 1.7 | 7.9 | 1.2 | |
| 0405690201 | 2006-11-19 | 30.4 | 7.3 | 1.0 | |
| 0405690501 | 2006-11-25 | 20.9 | 6.0 | 0.8 | |
| NGC 1313 X-1/X-2 | 0106860101 | 2000-10-17 | 11.9 | 4.9/1.5 | 0.7/0.2 |
| 3.95 Mpc | 0150280301 | 2003-12-21 | 7.0 | 8.6/6.4 | 1.0/0.9 |
| 0150280401 | 2003-12-23 | 3.0 | 6.4/7.5 | 0.7/1.0 | |
| 0150280501 | 2003-12-25 | 6.6 | −/2.8 | −/0.5 | |
| 0150280601 | 2004-01-08 | 8.2 | 7.7/2.2 | 0.8/0.4 | |
| 0205230301 | 2004-06-05 | 8.6 | 6.7/7.5 | 1.0/1.0 | |
| 0205230401 | 2004-08-23 | 3.8 | 3.0/1.7 | 0.6/0.3 | |
| 0205230501 | 2004-11-23 | 12.5 | −/1.7 | −/0.3 | |
| 0205230601 | 2005-02-07 | 8.4 | 5.2/7.1 | 0.6/1.0 | |
| 0301860101 | 2006-03-06 | 16.6 | −/6.5 | −/0.7 | |
| 0405090101 | 2006-10-15 | 74.0 | 4.9/6.2 | 0.7/0.7 | |
| Ho II X-1 | 0112520601 | 2002-04-10 | 4.6 | 8.5 | 3.2 |
| 3.34 Mpc | 0112520701 | 2002-04-16 | 2.1 | 7.7 | 2.8 |
| 0112520901 | 2002-09-18 | 3.5 | 1.9 | 0.8 | |
| 0200470101 | 2004-04-15 | 22.2 | 9.1 | 3.1 | |
| 0561580401 | 2010-03-26 | 21.0 | 3.3 | 1.3 | |
| Ho IX X-1 | 0112521001 | 2002-04-10 | 7.0 | 14.6 | 1.9 |
| 4.23 Mpc | 0112521101 | 2002-04-16 | 7.6 | 16.7 | 2.2 |
| 0200980101 | 2004-09-26 | 57.2 | 12.6 | 1.5 | |
| 0657801801 | 2011-09-26 | 6.9 | 23.1 | 2.5 | |
| 0657802001 | 2011-03-24 | 2.7 | 16.7 | 1.4 | |
| 0657802201 | 2011-11-23 | 12.6 | 22.1 | 2.3 | |
| IC 342 X-1 | 0093640901 | 2001-02-11 | 4.8 | 3.4 | 0.3 |
| 3.61 Mpc | 0206890101 | 2004-02-20 | 6.8 | 7.5 | 0.9 |
| 0206890201 | 2004-08-17 | 17.1 | 3.9 | 0.4 | |
| 0206890401 | 2005-02-10 | 3.3 | 11.0 | 1.2 | |
| NGC 55 ULX-1 | 0028740201 | 2001-11-14 | 30.4 | 1.5 | 1.4 |
| 1.95 Mpc | 0655050101 | 2010-05-24 | 56.6 | 0.6 | 0.8 |
| ULX . | Obs.ID . | Obs. date . | Useful exposure . | Lx . | Count rate . |
|---|---|---|---|---|---|
| . | . | . | (ks) . | ( × 1039 erg s− 1) . | (ct s−1) . |
| NGC 5408 X-1 | 0302900101 | 2006-01-13 | 85.4 | 4.8 | 1.0 |
| 4.85 Mpc | 0500750101 | 2008-01-13 | 28.6 | 4.5 | 0.9 |
| 0653380201 | 2010-07-17 | 71.8 | 5.6 | 1.2 | |
| 0653380301 | 2010-07-19 | 88.2 | 5.6 | 1.1 | |
| 0653380401 | 2011-01-26 | 73.4 | 5.3 | 1.1 | |
| 0653380501 | 2011-01-28 | 69.2 | 5.3 | 1.0 | |
| NGC 6946 X-1 | 0200670101 | 2004-06-09 | 2.1 | 3.8 | 0.3 |
| 5.96 Mpc | 0200670301 | 2004-06-13 | 10.0 | 3.0 | 0.3 |
| 0200670401 | 2004-06-25 | 3.2 | 3.8 | 0.3 | |
| 0401360301 | 2006-06-18 | 2.7 | 3.4 | 0.3 | |
| 0500730101 | 2007-11-08 | 17.4 | 3.0 | 0.2 | |
| 0500730201 | 2007-11-02 | 24.5 | 2.6 | 0.2 | |
| 0691570101 | 2012-10-21 | 81.1 | 3.8 | 0.4 | |
| NGC 5204 X-1 | 0142770101 | 2003-01-06 | 13.9 | 4.8 | 0.6 |
| 5.15 Mpc | 0142770301 | 2003-04-25 | 4.1 | 6.4 | 0.8 |
| 0150650301 | 2003-05-01 | 4.6 | 6.7 | 1.0 | |
| 0405690101 | 2006-11-15 | 1.7 | 7.9 | 1.2 | |
| 0405690201 | 2006-11-19 | 30.4 | 7.3 | 1.0 | |
| 0405690501 | 2006-11-25 | 20.9 | 6.0 | 0.8 | |
| NGC 1313 X-1/X-2 | 0106860101 | 2000-10-17 | 11.9 | 4.9/1.5 | 0.7/0.2 |
| 3.95 Mpc | 0150280301 | 2003-12-21 | 7.0 | 8.6/6.4 | 1.0/0.9 |
| 0150280401 | 2003-12-23 | 3.0 | 6.4/7.5 | 0.7/1.0 | |
| 0150280501 | 2003-12-25 | 6.6 | −/2.8 | −/0.5 | |
| 0150280601 | 2004-01-08 | 8.2 | 7.7/2.2 | 0.8/0.4 | |
| 0205230301 | 2004-06-05 | 8.6 | 6.7/7.5 | 1.0/1.0 | |
| 0205230401 | 2004-08-23 | 3.8 | 3.0/1.7 | 0.6/0.3 | |
| 0205230501 | 2004-11-23 | 12.5 | −/1.7 | −/0.3 | |
| 0205230601 | 2005-02-07 | 8.4 | 5.2/7.1 | 0.6/1.0 | |
| 0301860101 | 2006-03-06 | 16.6 | −/6.5 | −/0.7 | |
| 0405090101 | 2006-10-15 | 74.0 | 4.9/6.2 | 0.7/0.7 | |
| Ho II X-1 | 0112520601 | 2002-04-10 | 4.6 | 8.5 | 3.2 |
| 3.34 Mpc | 0112520701 | 2002-04-16 | 2.1 | 7.7 | 2.8 |
| 0112520901 | 2002-09-18 | 3.5 | 1.9 | 0.8 | |
| 0200470101 | 2004-04-15 | 22.2 | 9.1 | 3.1 | |
| 0561580401 | 2010-03-26 | 21.0 | 3.3 | 1.3 | |
| Ho IX X-1 | 0112521001 | 2002-04-10 | 7.0 | 14.6 | 1.9 |
| 4.23 Mpc | 0112521101 | 2002-04-16 | 7.6 | 16.7 | 2.2 |
| 0200980101 | 2004-09-26 | 57.2 | 12.6 | 1.5 | |
| 0657801801 | 2011-09-26 | 6.9 | 23.1 | 2.5 | |
| 0657802001 | 2011-03-24 | 2.7 | 16.7 | 1.4 | |
| 0657802201 | 2011-11-23 | 12.6 | 22.1 | 2.3 | |
| IC 342 X-1 | 0093640901 | 2001-02-11 | 4.8 | 3.4 | 0.3 |
| 3.61 Mpc | 0206890101 | 2004-02-20 | 6.8 | 7.5 | 0.9 |
| 0206890201 | 2004-08-17 | 17.1 | 3.9 | 0.4 | |
| 0206890401 | 2005-02-10 | 3.3 | 11.0 | 1.2 | |
| NGC 55 ULX-1 | 0028740201 | 2001-11-14 | 30.4 | 1.5 | 1.4 |
| 1.95 Mpc | 0655050101 | 2010-05-24 | 56.6 | 0.6 | 0.8 |
Notes: observational properties of the sample of ULXs studied in this paper including the XMM–Newton observation ID, date of exposure, duration of spectral exposure (after accounting for background flares and dead time), 0.3–10 keV X-ray luminosity (absorbed, determined from the model as per the text) using distances from NASA NED (http://ned.ipac.caltech.edu) provided below the source name, and EPIC-PN count rate. In the case of NGC 1313, ‘-’ indicates that X-1 was outside of the detector's field of view when the observation was taken.
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